Cactus RQ250 portable monolight

[xpatUSA]

Ted,

I may have misunderstood you when you mentioned lack of knowledge re: "flash", "strobe", speedlight", etc."

You may very well know all this information but here it is from flash powder to TTL electronic flash...

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Thank you Richard for taking the time to explain all of that. I knew some but not all. For example, I now know the origin of 'BULB' and 'speedlight' ...

[rpcrowe]

I am old enough to remember some cameras that did not have flash sync and I remember when an f/3.5 was considered pretty run of the mill fast and f/2.8 was considered as very fast...

The terms fast and slow regarding the f/stops of lenses obviously evolves from the shutter speed you could use with the various f/stops. In equivalent light conditions and with the same film speed, of course, f/2.8 would allow you to use a faster shutter speed than f/4 or f/5.6, therefore f/2.8 is faster than f/4 or f/5.6...